Illegally taking a singlet off (8)

I believe the answer is:

stealing

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'illegally taking' is the definition.
'stealing' can be an answer for 'taking' (stealing is a kind of taking). I'm not certain of the 'illegally' bit.

'a singlet off' is the wordplay.
'off' is an anagram indicator.
'a'+'singlet'='asinglet'
'asinglet' is an anagram of 'STEALING'.

Can you help me to learn more?

(Other definitions for stealing that I've seen before include "Taking illegally" , "Robbing" , "Illegally removing" , "Thieving" , "Theft" .)

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