Act on behalf of engineers attending (9)

I believe the answer is:

represent

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'act on behalf' is the definition.
'represent' can be an answer for 'act' (synonyms). I am not certain of the 'on behalf' bit.

'engineers attending' is the wordplay.
'engineers' becomes 're' (Royal Engineers).
'attending' becomes 'present' (similar in meaning).
're'+'present'='REPRESENT'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for represent that I've seen before include "Stand for or symbolise" , "Illustrate" , "show" , "Play the part" , "Ambassadors do it" .)

I've seen this clue in The Telegraph.

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