Golf club: Irish one, not English (4)
I believe the answer is:
iron
'golf club' is the definition.
(type of golf club)
'irish one not english' is the wordplay.
'irish' becomes 'IR' (abbreviation).
'not' suggests deleting specific letters.
'english' becomes 'e' (abbreviation).
'one' with 'e' removed is 'on'.
'ir'+'on'='IRON'
(Other definitions for iron that I've seen before include "Box-shaped instrument of torture -- no meridian (anag)" , "Smooth - metal" , "Smoother - metal" , "A magnet attracts it" , "Metal - press" .)