Sale involved city ranch without redundant warning (5,5)

I believe the answer is:

false alarm

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

'redundant warning' is the definition.
'false alarm' can be an answer for 'warning' (I have seen 'Unnecessary warning ' mean 'false alarm' so perhaps 'warning' could also mean 'false alarm'). I'm not sure about the 'redundant' bit.

'sale involved city ranch without' is the wordplay.
'involved' indicates an anagram (involved can mean confusing or complex).
'city' becomes 'LA' (Los Angeles).
'ranch' becomes 'farm' (I've seen this before).
'without' means one lot of letters goes inside another.
'sale' anagrammed gives 'lsea'.
'lsea'+'la'='lseala'
'lseala' inserted within 'farm' is 'FALSE ALARM'.

Can you help me to learn more?

(Other definitions for false alarm that I've seen before include "unfounded scare?" , "Warning proving unnecessary" , "Panic over" .)

I've seen this clue in The Daily Express.

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