Crossword Genius

Killer from Portugal caught — arrested by state police (7,4)

Ross

I believe the answer is:

prussic acid

'killer from portugal' is the definition.
'prussic acid' can be an answer for 'killer' (prussic acid is a poison). I am unsure of the 'from portugal' bit.

'caught arrested by state police' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'arrested by' indicates putting letters inside (I've seen this in other clues).
'state' becomes 'prussia' (I have seen 'Old state' mean 'prussia' so perhaps 'state' could also mean 'prussia').
'police' becomes 'CID' (abbreviation for Criminal Investigation Department).
'c' inserted into 'prussia' is 'prussica'.
'prussica'+'cid'='PRUSSIC ACID'

I've seen this clue in The Guardian.
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