Rook with slippery fish totters (5)
I believe the answer is:
reels
'totters' is the definition.
(I've seen this before)
'rook with slippery fish' is the wordplay.
'rook' becomes 'R' (chess abbreviation).
'with' means one lot of letters go next to another.
'slippery fish' becomes 'eels' (I've seen this before).
'r'+'eels'='REELS'
(Other definitions for reels that I've seen before include "Bobbins" , "Staggers about in Irish dances" , "Staggers about in lively dances" , "Scottish dances" , "Rolls of movie film" .)