Wrongly advises girl about heavy metal (8)
I believe the answer is:
misleads
'wrongly advises' is the definition.
(I've seen this before)
'girl about heavy metal' is the wordplay.
'girl' becomes 'miss' (I've seen this before**).
'about' means one lot of letters goes inside another.
'heavy metal' becomes 'lead' (I've seen this before).
'miss' going around 'lead' is 'MISLEADS'.
(Other definitions for misleads that I've seen before include "Deceives or sends in wrong direction" , "Gives false information to" , "Directs wrongly" , "Sends astray or gives false impression to" , "Wrongly advises" .)