Impressed by intrepid manoeuvring across top of minefield (9)
I believe the answer is:
imprinted
'impressed' is the definition.
('imprint' can be a synonym of 'impress')
'intrepid manoeuvring across top of minefield' is the wordplay.
'manoeuvring' indicates an anagram.
'across' means one lot of letters goes inside another.
'top of' indicates taking the first letters.
The first letter of 'minefield' is 'm'.
'intrepid' anagrammed gives 'iprinted'.
'iprinted' placed around 'm' is 'IMPRINTED'.
'by' is the link.
(Other definitions for imprinted that I've seen before include "made mark" , "Impressed" .)