Crossword Genius

In retrospect, part of explicit song actually is without conviction (8)

Ross

I believe the answer is:

agnostic

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'without conviction' is the definition.
I can't tell whether this definition defines the answer.

'in retrospect part of explicit song actually' is the wordplay.
'in retrospect' is a reversal indicator (in retrospect means looking back).
'part of' indicates a hidden word.
'citsonga' can be found hidden inside 'explicit song actually'.
'citsonga' in reverse letter order is 'AGNOSTIC'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for agnostic that I've seen before include "One doubts" , "Believing that nothing can be known about the existence of God" , "No firm believer" , "Coasting as one who believes the mind cannot know anything of a god" , "One believes that nothing can be known about the existence of God" .)

I've seen this clue in The Times.
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