Crossword Genius

Promise to put pressure on sill (6)

Ross

I believe the answer is:

pledge

'promise' is the definition.
(I know that pledge is a more specific form of promise)

'pressure on sill' is the wordplay.
'pressure' becomes 'p' (scientific abbreviation).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'sill' becomes 'ledge' (I've seen this before).
'p'+'ledge'='PLEDGE'

'to put' is the link.

(Other definitions for pledge that I've seen before include "Solemn undertaking" , "Vow, affirm" , "Give one's word" , "Deposit" , "assurance" .)

I've seen this clue in The Mirror and The Daily Express.
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