Spot decrepit man wandering about (11)
I believe the answer is:
predicament
'spot' is the definition.
(thesaurus)
'decrepit man wandering about' is the wordplay.
'wandering about' indicates anagramming the letters (I've seen this in other clues).
'decrepit'+'man'='decrepitman'
'decrepitman' is an anagram of 'PREDICAMENT'.
(Other definitions for predicament that I've seen before include "in corner" , "Perplexing situation" , "Quandary" , "Dilemma" , "Scrape" .)