Dry run overwhelmed by support (4)
I believe the answer is:
arid
'dry' is the definition.
(similar in meaning)
'run overwhelmed by support' is the wordplay.
'run' becomes 'r' (cricket abbreviation).
'overwhelmed by' means one lot of letters goes inside another (inserted letters get absorbed or overwhelmed).
'support' becomes 'aid' (to aid is to help or support).
'r' going within 'aid' is 'ARID'.
(Other definitions for arid that I've seen before include "(Of land) very dry" , "Dry and barren" , "Sterile" , "Wadi may be this" , "Excessively dry" .)