Move cautiously with small loaf (5)
I believe the answer is:
sidle
'move cautiously' is the definition.
(I've seen this in another clue)
'with small loaf' is the wordplay.
'with' says to put letters next to each other.
'small' becomes 's' (abbreviation - e.g. clothes size).
'loaf' becomes 'idle' (I've seen this in another clue).
's' next to 'idle' is 'SIDLE'.
(Other definitions for sidle that I've seen before include "Slink, creep, sneak" , "Isled (anag.)" , "Walk obliquely" , "Inch along" , "Walk sideways in furtive manner" .)