Fitting in gap tightly (3)

I believe the answer is:

apt

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

'in gap tightly' is the wordplay.
'in' indicates the answer is hidden within the clue.
'APT' can be found hidden inside 'gap tightly'.

(Other definitions for apt that I've seen before include "Suitable or likely" , "Suitable; quick to learn" , "Tap (anag.)" , "Apposite, appropriate" , "Fit, suitable" .)

I've seen this clue in The Sun and The Times.

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