Inserts more bullets: corps has lots (7)
I believe the answer is:
reloads
'inserts more bullets' is the definition.
(as in loading a gun with bullets)
'corps has lots' is the wordplay.
'corps' becomes 'RE' (Royal Engineers army regiment).
'has' is a charade indicator (letters next to each other).
'lots' becomes 'loads' (synonyms).
're'+'loads'='RELOADS'
I've seen this clue in The Guardian.
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