Police officer happy after promotion? Makes sense (4,2)
I believe the answer is:
adds up
'makes sense' is the definition.
('add up' can be a synonym of 'make sense')
'police officer happy after promotion?' is the wordplay.
'police officer' becomes 'DS' (abbreviation for Detective Sergeant).
'happy' becomes 'up' (I've seen this in other clues).
'after' is a charade indicator (letters next to each other).
'promotion?' becomes 'ad' (short for advert).
'ds'+'up'='dsup'
'dsup' after 'ad' is 'ADDS UP'.
(Other definitions for adds up that I've seen before include "Totals" , "Puts two and two together" , "Reckons" , "Sums - makes sense" , "Tots" .)