Salmon's head right in net — pull out (7)
I believe the answer is:
scratch
'pull out' is the definition.
(I've seen this before)
'salmon's head right in net' is the wordplay.
'head' says to take the initial letters.
'right' becomes 'r' (common abbreviation).
'in' means one lot of letters goes inside another.
'net' becomes 'catch' (I've seen this in another clue).
The first letter of 'salmons' is 's'.
'r' put inside 'catch' is 'cratch'.
's'+'cratch'='SCRATCH'
(Other definitions for scratch that I've seen before include "Write hurriedly" , "Pull out (of a race)" , "Old Nick" , "Score with a sharp object" , "Fine, up to this" .)