Crossword Genius

When in Golf covering kilometres is demanding (6)

Ross

I believe the answer is:

'is demanding' is the definition.
(I've seen this before)

'when in golf covering kilometres' is the wordplay.
'when' becomes 'as'.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'covering' is an insertion indicator.
'kilometres' becomes 'k'.
'as'+'in'+'g'='asing'
'asing' placed around 'k' is 'ASKING'.

(Other definitions for asking that I've seen before include "Posing a question", "For the ___; freely available", "Inquiry", "Appealing", "Making request".)

I've seen this clue in The Independent.