Reproaches oneself about having spent foolishly (7)

I believe the answer is:

repents

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'reproaches oneself' is the definition.
I can't judge whether this defines the answer.

'about having spent foolishly' is the wordplay.
'about' becomes 're' (regarding**).
'having' means one lot of letters go next to another.
'foolishly' is an anagram indicator.
'spent' is an anagram of 'pents'.
're'+'pents'='REPENTS'

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(Other definitions for repents that I've seen before include "Expresses sorrow for sin" , "Present (anag.)" , "Turns away from evil" , "Feels sincere remorse" , "Feels remorse for, sin perhaps" .)

I've seen this clue in the Evening Standard.

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