Crossword Genius

Make a deep impression in Bletchley (4)

Ross

I believe the answer is:

etch

'make a deep impression' is the definition.
(I've seen this before)

'in bletchley' is the wordplay.
'in' indicates a hidden word.
'ETCH' is hidden within 'bletchley'.

(Other definitions for etch that I've seen before include "Eat away with acid" , "Engrave deeply" , "Chase" , "Carve (design) on a surface" , "Wear away by chemical reaction" .)

I've seen this clue in The Telegraph.
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