Relaxed as not spotted snatching rupees (10)

I believe the answer is:

unstrained

'relaxed' is the definition.
(similar in meaning)

'not spotted snatching rupees' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'spotted' becomes 'stained' ('stain' can be a synonym of 'spot').
'snatching' indicates putting letters inside.
'rupees' becomes 'r' (abbreviation for rupees).
'stained' placed around 'r' is 'strained'.
'un'+'strained'='UNSTRAINED'

'as' is the link.

(Another definition for unstrained that I've seen is " relaxed".)

I've seen this clue in The Times.

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