Join female in a predicament (5)
I believe the answer is:
Here is my best explanation:
'join' is the definition.
'female in a predicament' is the subsidiary indication.
'female' becomes 'f' (abbreviation).
'in' means one lot of letters goes inside another.
'predicament' becomes 'fix' (I've seen this before).
'f' inserted inside 'afix' is 'affix'.
(Other definitions for affix that I've seen before include "Fasten (to something)", "Append", "Stick on", "Attach", "Glue" and "Join".)