Toughest RAF training in great demand (6-5)

I believe the answer is:

sought-after

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'toughest raf training in great demand' is the definition.
I can't judge whether this defines the answer.

'toughest raf training' is the wordplay.
'training' indicates anagramming the letters (to train can mean to grow something into a shape).
'toughest'+'raf'='toughestraf'
'toughestraf' with letters rearranged gives 'SOUGHT-AFTER'.

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(Another definition for sought-after that I've seen is " much in demand".)

I've seen this clue in The Times.

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