Crossword Genius

Making the best of work with insufficient time, I croon (10)

Ross

I believe the answer is:

optimising

'making the best of' is the definition.

'work with insufficient time i croon' is the wordplay.
'work' becomes 'op' (abbreviation for opus**).
'with' is a charade indicator (letters next to each other).
'insufficient' means to remove the last letter.
'croon' becomes 'sing' (I've seen this before).
'time' with its last letter removed is 'tim'.
'op'+'tim'+'i'+'sing'='OPTIMISING'

(Another definition for optimising that I've seen is " Using best".)

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