Companies supply wood and paper for publication (5)
I believe the answer is:
firms
'companies' is the definition.
(I've seen this before)
'wood and paper for publication' is the wordplay.
I cannot quite see how this works, but
'wood' could be 'fir' (fir is a kind of wood) and 'fir' is present in the answer.
'paper' could be 'ms' (abbreviation for manuscript) and 'ms' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'supply' is the link.
Can you help me to learn more?
(Another definition for firms that I've seen is " Companies".)