Crossword Genius

Play in a clever way, i.e. quickly (7)

Ross

I believe the answer is:

sharply

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Here is my best explanation:

'quickly' is the definition.
(thesaurus)

'play in a clever way i' is the wordplay.
'play' becomes 'harp' (harping is a kind of playing).
'in' indicates putting letters inside.
'a clever way i' becomes 'sly' (I can't justify this - if you can you should believe this answer much more).
'harp' inserted into 'sly' is 'SHARPLY'.

'e' is the link.
This may not be correct. It may belong to another bit of the clue.

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This clue was last seen in Evening Standard