Great aid agreed, keeping Arab land waiting (7,7)

I think it could be either:

Which length description are you looking for?:

7,7

yeomans service

'great aid' is the definition.
(phrase referring to a great service)

'agreed keeping arab land waiting' is the wordplay.
'agreed' becomes 'yes' (I've seen this before).
'keeping' is an insertion indicator.
'arab land' becomes 'oman'.
'waiting' becomes 'service' (I've seen this before).
'yes' enclosing 'oman' is 'yeomans'.
'yeomans'+'service'='YEOMANS SERVICE'

I've seen this clue in The Guardian.

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