Female concealing passion for guard (7)
I believe the answer is:
sheathe
'guard' is the definition.
Although both the answer and definition are verbs in their base form, I can't understand how one could define the other.
'female concealing passion' is the wordplay.
'female' becomes 'she' (I've seen this before).
'concealing' means one lot of letters goes inside another.
'passion' becomes 'heat' ('heat' can be a synonym of 'passion').
'she' placed around 'heat' is 'SHEATHE'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for sheathe that I've seen before include "Cover in case" , "Put into scabbard" , "Put (a sword) into case" , "Put (a sword) into its holder" , "Put (a sword) it its cover" .)