This is better:
Licking the frosting off a cupcake is akin to gambling (6)
Dicing?
I think Dicing is right. It “D” (pronounced dee) + icing.
I thought there was a connection between “D” and “Licking” until you sounded it out: “de-icing”
Formorian giants told me to go to German city. (9)
This uses an anagram.
The answer is not the actual name of a German city, is it?
It also uses TEN letters, not nine.
INGOLSTADT (anagram of GIANTS TOLD)
+++++
Ornately decorated hat. (8)
TYROLEAN (anagram of ORNATELY)
The Annunciation: prayer of devotion or strange lust? (7)
ANGELUS (strange lust)
Russian leader is slowin’ down. (6)
Stalin (homophone)
+++++
Soothing rub is made of lime, innit? (8)
LINIMENT (anagram lime innit)
+++++
Transsexual postal carriers have perplexing psychic powers (9)
I think the answer is MENTALISM, but I’m not sure how it gets there. Mint males anagram?
LINIMENT (anagram lime innit)
(With an extra “I” , however)
+++++
Transsexual postal carriers have perplexing psychic powers (9)
MENTALISM (anagram of MAILMEN and TS?)
+++++
You are up, Knowed_Out.
MENTALISM (anagram of MAILMEN and TS?)
CORRECT
I defer this one to you Biotop.
Showing hearts and spades and melons or lemons, perhaps? (6)
No bridge players here? 
Bridge convention that shows hearts and spades…
SMOLEN (double definition and anagram)
I thought the answer could have been MAJORS, but I couldn’t work out the supporting clues.
Smith series is about a glasses guy. (7)