Hesitating? Sure loiter about (10)
I believe the answer is:
irresolute
'hesitating?' is the definition.
('irresolute' can be similar in meaning to 'hesitating')
'sure loiter about' is the wordplay.
'about' indicates an anagram.
'sure'+'loiter'='sureloiter'
'sureloiter' anagrammed gives 'IRRESOLUTE'.
(Other definitions for irresolute that I've seen before include "lacking clear purpose" , "Hesitating" , "Indecisive" , "Hesitant, uncertain" .)