Crossword Genius

Somewhat eastwards, on and off (1,3)

Ross

I believe the answer is:

a tad

'somewhat' is the definition.
('a tad' can mean 'somewhat' or 'slightly')

'eastwards on and off' is the wordplay.
'on and off' indicates alternate letters (letters selected on and off at regular intervals).
The alternate letters of 'eastwards' are 'A TAD'.

(Another definition for a tad that I've seen is " Not much".)

I've seen this clue in The Everyman puzzle in The Observer.
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