Rubbish travel agent, essentially (5)

I believe the answer is:

tripe

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'rubbish' is the definition.
(both can mean nonsense)

'travel agent essentially' is the wordplay.
'travel' becomes 'trip' (synonyms).
'agent essentially' becomes 'e' (I can't explain this - if you can you should give a lot more credence to this answer).
'trip'+'e'='TRIPE'

Can you help me to learn more?

(Other definitions for tripe that I've seen before include "Rubbish; stomach as food" , "Rubbish (edible, maybe)" , "Pants" , "What some northerners eat" , "Rhubarb" .)

I've seen this clue in The Daily Express.

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