Crossword Genius

Wander about with son in lodgings (7)

Ross

I believe the answer is:

digress

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'wander' is the definition.
('digress' can be a synonym of 'wander')

'about with son in lodgings' is the wordplay.
'about with' becomes 're' (I can't explain this - if you can you should believe this answer much more).
'son' becomes 's'.
'in' means one lot of letters goes inside another.
'lodgings' becomes 'digs' ('digs' can be a synonym of 'lodgings').
're'+'s'='res'
'res' going within 'digs' is 'DIGRESS'.

Can you help me to learn more?

(Other definitions for digress that I've seen before include "Depart from the main subject" , "Stray from main subject" , "Stray from the point" , "Wander from subject" , "Go off topic" .)

I've seen this clue in The Telegraph.
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