Feel pressure line evident in adult head (7)
I believe the answer is:
palpate
'feel' is the definition.
(synonyms)
'pressure line evident in adult head' is the wordplay.
'pressure' becomes 'p' (abbreviation).
'line' becomes 'l'.
'evident in' indicates putting letters inside.
'adult' becomes 'a' (abbreviation).
'head' becomes 'pate' (humorous term for the head).
'a'+'pate'='apate'
'l' inserted within 'apate' is 'alpate'.
'p'+'alpate'='PALPATE'
(Other definitions for palpate that I've seen before include "needed to make pressing investigation" , "Touch" , "Examine medically by feeling with hands" .)