Poll: Her Maj getting more sexy? (5)
I believe the answer is:
cuter
'more sexy?' is the definition.
(cute can mean attractive or sexy)
'poll her maj getting' is the wordplay.
'poll' becomes 'cut' (poll can mean to cut off).
'her maj' becomes 'ER' (Elizabeth Regina ie Her Majesty Queen Elizabeth).
'getting' is a charade indicator (letters next to each other).
'cut'+'er'='CUTER'
(Other definitions for cuter that I've seen before include "More attractive" , "Having raised appeal" .)