Crossword Genius

Thinner, but wiser about the Greek character (7)

Ross

I believe the answer is:

wispier

'thinner' is the definition.
('wispy' can be similar in meaning to 'thin')

'wiser about the greek character' is the wordplay.
'about' is an insertion indicator.
'the greek character' becomes 'pi' (letter from the Greek alphabet).
'wiser' enclosing 'pi' is 'WISPIER'.

'but' acts as a link.

(Another definition for wispier that I've seen is " increasingly faint".)

I've seen this clue in the Sydney Morning Herald.
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