Crossword Genius

Foot a self-declaration by public transporter (6)

Ross

I believe the answer is:

iambus

I'm a little stuck... Click here to teach me more about this clue!

'foot' is the definition.
(I know that iambus is a type of foot)

'a self-declaration by public transporter' is the wordplay.
'a self declaration' becomes 'iam' (I can't justify this - if you can you should give a lot more credence to this answer).
'by' is a charade indicator (letters next to each other).
'public transporter' becomes 'bus'.
'iam'+'bus'='IAMBUS'

Can you help me to learn more?

(Other definitions for iambus that I've seen before include "Metrical foot" , "poetic form" , "Metrical unit of two syllables" , "Type of metrical unit in a poem" .)

I've seen this clue in the Sydney Morning Herald.
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