Unfair pressure on skilled worker (8)

I believe the answer is:

partisan

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'unfair' is the definition.
(I've seen this before)

'pressure on skilled worker' is the wordplay.
'pressure on' becomes 'p' (abbreviation. I am not sure about the 'on' bit.**).
'skilled worker' becomes 'artisan' (artisan is a kind of skilled worker).
'p'+'artisan'='PARTISAN'

Can you help me to learn more?

(Other definitions for partisan that I've seen before include "Enthusiastic supporter" , "One-sided" , "In Sparta (anag)" , "Inclining to one side" , "Arts pain (anag.)" .)

I've seen this clue in The Telegraph.

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