Ask worker who is an expert in their field (10)

I believe the answer is:

consultant

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'is an expert in their field' is the definition.
I can't tell whether this definition defines the answer.

'ask worker' is the wordplay.
'ask' becomes 'consult' (consulting is a kind of asking).
'worker' becomes 'ant' (worker is a type of ant).
'consult'+'ant'='CONSULTANT'

'who' acts as a link.

Can you help me to learn more?

(Other definitions for consultant that I've seen before include "Specialist" , "See 1 across" , "Senior hospital doctor" , "Adviser" .)

I've seen this clue in The Irish Times.

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