Girl, we hear, given to pranks (7)
I believe the answer is:
tricksy
'girl we hear' is the definition.
I can't judge whether this defines the answer.
'given to pranks' is the wordplay.
'given' becomes 'y' (I can't explain this - if you can you should believe this answer much more).
'to' says to put letters next to each other (I've seen this in other clues).
'pranks' becomes 'tricks' ('trick' can be a synonym of 'prank').
'y' after 'tricks' is 'TRICKSY'.
Can you help me to learn more?
(Other definitions for tricksy that I've seen before include "involved" , "Mischievous" .)