Evident on top of letter (5)

I believe the answer is:

overt

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

'on top of letter' is the wordplay.
'on top of' becomes 'over' (I've seen this before).
'letter' becomes 't' ().
'over'+'t'='OVERT'

(Other definitions for overt that I've seen before include "Not locked away" , "Plain to see - manifest" , "not disguised" , "Explicit" , "Obvious, patent" .)

I've seen this clue in The Irish Independent.

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