Fit cheap, tatty clothes (3)
I believe the answer is:
apt
'fit' is the definition.
(apt means appropriate or fitting)
'cheap tatty clothes' is the wordplay.
'clothes' indicates the answer is hidden within the clue (the letters clothe the hidden word).
'APT' can be found hidden inside 'cheap tatty'.
(Other definitions for apt that I've seen before include "Relevant" , "clever" , "Befitting" , "Pertinent" , "Liable" .)