In pain, did stagger when walking (7)

I believe the answer is:

padding

'walking' is the definition.
(padding is a kind of walking)

'in pain did stagger' is the wordplay.
'in' indicates putting letters inside.
'pain' becomes 'pang' (pang is a kind of pain).
'stagger' indicates an anagram (I've seen 'staggered' mean this).
'did' anagrammed gives 'ddi'.
'pang' placed around 'ddi' is 'PADDING'.

'when' acts as a link.

(Another definition for padding that I've seen is " Soft stuffing".)

I've seen this clue in the Evening Standard.

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