Sycophant is curious about travel agents retiring (3-6)

'sycophant' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'curious about travel agents retiring' is the wordplay.
'curious' becomes 'nosey' (similar in meaning).
'about' is an insertion indicator.
'travel agents' becomes 'reps' (I am not sure about this - if you are sure you should believe this answer much more).
'retiring' says the letters should be written in reverse.
'nosey' going around 'reps' is 'nosrepsey'.
'nosrepsey' reversed gives 'YES-PERSON'.

'is' acts as a link.

Can you help me to learn more?