Pinches lass's rear then ducks (6)

I believe the answer is:

steals

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'pinches' is the definition.

'lass's rear then ducks' is the wordplay.
'lass's rear' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'then' means one lot of letters go next to another.
'ducks' becomes 'teals' (teal is a kind of duck).
's'+'teals'='STEALS'

Can you help me to learn more?

(Other definitions for steals that I've seen before include "Robs" , "Takes property without right or permission" , "Pilfer, filch" , "Purloins" , "Pilfers" .)

I've seen this clue in The Telegraph.

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