Bianca's man after time becomes devious (6)
I believe the answer is:
tricky
'devious' is the definition.
(I've seen this in another clue)
'bianca's man after time' is the wordplay.
I cannot quite understand how this works, but
'man' could be 'ricky' and 'ricky' is present in the answer.
'time' could be 't' (abbreviation) and 't' is found in the answer.
No letters remain.
This explanation may well be incorrect...
'becomes' is the link.
Can you help me to learn more?
(Other definitions for tricky that I've seen before include "Deceitful, crafty" , "Crafty or difficult" , "Difficult; sly" , "Crafty, cunnning" , "Awkward - dishonest" .)