A Dubliner's about to take in dress for tiny bodies (9)

I believe the answer is:

anaerobes

'tiny bodies' is the definition.
(type of microbe)

'a dubliner's about to take in dress' is the wordplay.
'a dubliner' becomes 'seana' (common Irish name).
'about' says the letters should be written in reverse.
'to take in' is an insertion indicator.
'dress' becomes 'robe' (robing is a kind of dressing).
'seana' backwards is 'anaes'.
'anaes' placed around 'robe' is 'ANAEROBES'.

'for' is the link.

I've seen this clue in The Guardian.

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