Crossword Genius

Intrusions caused by old-fashioned inside lock (10)

Ross

I believe the answer is:

trespasses

'intrusions' is the definition.
('trespass' can be a synonym of 'intrusion')

'old-fashioned inside lock' is the wordplay.
'old-fashioned' becomes 'passe' (synonyms).
'inside' is an insertion indicator.
'lock' becomes 'tress' (both can mean a piece of hair).
'passe' going within 'tress' is 'TRESPASSES'.

'caused by' is the link.

(Other definitions for trespasses that I've seen before include "Forgive them" , "may they be forgiven!" , "Unlawfully enters" .)

I've seen this clue in The Telegraph.
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