Crossword Genius

Criticise dyke builder's mistake after rupture (4,3,1,5)

Ross

I believe the answer is:

tear off a strip

I'm a little stuck... Click here to teach me more about this clue!

'criticise' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'dyke builder's mistake after rupture' is the wordplay.
'dyke builder' becomes 'offa' (I've seen this before).
'mistake' becomes 'strip' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'after' means one lot of letters go next to another.
'rupture' becomes 'tear' (synonyms).
'offa'+'strip'='offastrip'
'offastrip' after 'tear' is 'TEAR OFF A STRIP'.

Can you help me to learn more?

(Other definitions for tear off a strip that I've seen before include "Reprimand" , "Carpet" , "how to make it a bit narrower?" .)

I've seen this clue in The Independent.
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