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