Simple man’s abandoned without pity (7)
I believe the answer is:
artless
'simple' is the definition.
(similar in meaning)
'man's abandoned without pity' is the wordplay.
'man' becomes 'he' (he refers to a man).
'abandoned' is a deletion indicator.
'without pity' becomes 'heartless'.
'heartless' with 'he' taken out is 'ARTLESS'.
(Other definitions for artless that I've seen before include "as an empty gallery" , "Clumsy and uncaring" , "Naive - unskilful" , "Nave" , "Natural like slaters" .)