Crossword Genius

On foot of finding one of them in Wellington

Ross

I believe the answer is:

instep

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'on foot of finding one of them' is the definition.
I can't judge whether this definition defines the answer.

'in wellington' is the wordplay.
'wellington' becomes 'step' (I can't justify this - if you can you should believe this answer much more).
'in'+'step'='INSTEP'

Can you help me to learn more?

(Other definitions for instep that I've seen before include "Foot arch - conforming" , "Part of foot between toes and ankle" , "Part of foot under spinet" , "Sir Jack --, famous English cricketer" , "downtrodden area" .)

I've seen this clue in The Irish Times.
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