Police force loves anti-harassment movement (2,3)
I believe the answer is:
me too
'anti-harassment movement' is the definition.
(I've seen this in another clue)
'police force loves' is the wordplay.
'police force' becomes 'met' (short for Metropolitan Police Service).
'loves' becomes 'oo' (love means 0 in tennis).
'met'+'oo'='ME-TOO'
(Other definitions for me too that I've seen before include "Like a follower of fashion" , "imitating" .)