In the way as very young son announced achievement (5,4,4)

I believe the answer is:

under ones feet

'in the way' is the definition.

'very young son announced achievement' is the wordplay.
'very young' becomes 'underone' (under one year of age).
'son' becomes 's'.
'announced' indicates a 'sounds like' (homophone) clue.
'achievement' becomes 'feat' (feat is a kind of achievement).
'feat' sounds like 'feet'.
'underone'+'s'+'feet'='UNDER ONES FEET'

'as' is the link.

I've seen this clue in The Times.

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