Give a yell when they briefly pass tongue over paint (7)
I believe the answer is:
acrylic
'paint' is the definition.
(acrylic paint is a kind of paint)
'give a yell when' is the wordplay.
'give' is a charade indicator (letters next to each other).
'yell' becomes 'cry' (synonyms).
'when' becomes 'lic' (I can't justify this - if you can you should believe this answer much more).
'a'+'cry' is 'acry'.
'acry'+'lic'='ACRYLIC'
'they briefly pass tongue over' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for acrylic that I've seen before include "Type of paint or textile fibre" , "Synthetic fibre or paint" , "fibre that's synthetic" , "Pungent acid" , "Kind of paint" .)