It's wrong for an officer to cheat at pinball (4)
I believe the answer is:
tilt
'cheat at pinball' is the definition.
(I've seen this in another clue)
'it's wrong for an officer' is the wordplay.
'wrong' indicates anagramming the letters.
'for' means one lot of letters go next to another.
'an officer' becomes 'lt' (abbreviation for lieutenant).
'it' anagrammed gives 'ti'.
'ti'+'lt'='TILT'
'to' acts as a link.
(Other definitions for tilt that I've seen before include "Heel over" , "Tip to one side" , "Cause to slope or incline" , "Slope; joust" , "Lean sideways" .)