Approaching resort of St Malo (6)
I believe the answer is:
almost
'approaching' is the definition.
(I've seen this in another clue)
'resort of st malo' is the wordplay.
'resort of' is an anagram indicator.
'st'+'malo'='stmalo'
'stmalo' anagrammed gives 'ALMOST'.
(Other definitions for almost that I've seen before include "Not totally" , "Well-nigh" , "practically" , "Nearly, not quite" , "Slightly short of" .)