Old artist following rock band, member of big fish's entourage (6)

I believe the answer is:

remora

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'member of big fish's entourage' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'old artist following rock band' is the wordplay.
'old' becomes 'o' (abbreviation).
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'following' is a charade indicator (letters next to each other).
'rock band' becomes 'rem' (REM are a US rock band).
'o'+'ra'='ora'
'ora' put after 'rem' is 'REMORA'.

Can you help me to learn more?

(Other definitions for remora that I've seen before include "Slender sea fish" , "Arm roe against suckerfish" .)

I've seen this clue in The Independent.

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