Come across smallest pig eating in ring (3,4)

I believe the answer is:

run into

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'come across' is the definition.
(synonyms)

'smallest pig eating in ring' is the wordplay.
'smallest pig' becomes 'runt' (I have seen 'Undersized pig' mean 'runt' so perhaps 'pig' could also mean 'runt'. I am not sure about the 'smallest' bit.).
'eating' means one lot of letters goes inside another.
'ring' becomes 'O' (letter resembling a ring).
'runt' going around 'in' is 'runint'.
'runint'+'o'='RUN INTO'

Can you help me to learn more?

(Other definitions for run into that I've seen before include "'Meet by chance (3,4)'" , "Come across, encounter" , "Encounter by chance - or collision?" , "charge?" , "Meet (someone) unexpectedly" .)

I've seen this clue in The Independent.

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