Crossword Genius

Active fellow, he gets things done (5)

Ross

I believe the answer is:

agent

'he gets things done' is the definition.

'active fellow' is the wordplay.
'active' becomes 'a' (grammatical abbreviation).
'fellow' becomes 'gent' (I've seen this before**).
'a'+'gent'='AGENT'

(Other definitions for agent that I've seen before include "Instrument" , "One acting on behalf of another" , "He or she acts for actors" , "One representing others" , "Factor, spy" .)

I've seen this clue in The Independent.
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