Perks I slam, not terribly fair (13)

I believe the answer is:

sportsmanlike

'fair' is the definition.
('sportsmanlike' can be similar in meaning to 'fair')

'perks i slam not terribly' is the wordplay.
'terribly' indicates an anagram.
'perks'+'i'+'slam'+'not'='perksislamnot'
'perksislamnot' is an anagram of 'SPORTSMANLIKE'.

(Other definitions for sportsmanlike that I've seen before include "Playing the game fairly" , "Like a fair player" .)

I've seen this clue in The Times.

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