Crossword Genius

Occasionally fair legal department (4)

Ross

I believe the answer is:

area

'department' is the definition.
(someone's department is their area of expertise)

'occasionally fair legal' is the wordplay.
'occasionally' indicates alternate letters (letters taken at regular intervals or occasions).
'fair'+'legal'='fairlegal'
The alternating letters of 'fairlegal' are 'AREA'.

(Other definitions for area that I've seen before include "Region, zone" , "part of town" , "'Tract, region (4)'" , "Space for a specific purpose, say picnic" , "Surface measurement" .)

I've seen this clue in The Telegraph.
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