Other son securing flat for timely break (9)

I believe the answer is:

elevenses

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'timely break' is the definition.
'elevenses' can be an answer for 'break' (I've seen this before). I am unsure of the 'timely' bit.

'other son securing flat' is the wordplay.
'other' becomes 'else' (synonyms).
'son' becomes 's' (genealogical abbreviation for son).
'securing' means one lot of letters goes inside another.
'flat' becomes 'even' (level).
'else'+'s'='elses'
'elses' placed around 'even' is 'ELEVENSES'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for elevenses that I've seen before include "Mid-morning snacks" , "Mid-morning refreshment" , "Mid-morning snack" , "Morning tea or coffee break" , "Refreshments" .)

I've seen this clue in The Times.

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