Nothing unusually posh in a voyage in this (9)

I believe the answer is:

troopship

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'this' is the definition.
The definition suggests a singular noun which matches the answer.

'nothing unusually posh in a voyage' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'unusually' is an anagram indicator.
'in' indicates putting letters inside.
'a voyage' becomes 'trip' (I've seen this in another clue).
'posh' anagrammed gives 'opsh'.
'o'+'opsh'='oopsh'
'oopsh' inserted into 'trip' is 'TROOPSHIP'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for troopship that I've seen before include "boat" , "As carrier" , "Military transport vessel" , "Army vessel" .)

I've seen this clue in The Globe and Mail.

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