Crossword Genius

Tell that many fit ones keep up (6)

Ross

I believe the answer is:

notify

'tell' is the definition.
(I've seen this before)

'many fit ones keep up' is the wordplay.
'keep' says the answer is hidden in the clue.
'up' is a reversal indicator (in down clue: letters go upwards).
'yfiton' is hidden within 'many fit ones'.
'yfiton' back-to-front is 'NOTIFY'.

'that' acts as a link.

(Other definitions for notify that I've seen before include "Declare" , "Formally tell" , "Formally advise" , "Formally inform" , "Officially inform" .)

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