Ride range as one of the guards (9)

I believe the answer is:

grenadier

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'one of the guards' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'ride range' is the wordplay.
'ride range' can be anagrammed to 'GRENADIER'.
Though, I am unsure how the anagram is indicated.

'as' is the link.

Can you help me to learn more?

(Other definitions for grenadier that I've seen before include "bomb-thrower" , "African flier" , "Soldier - in red gear (anag)" , "historical bomber" , "Re-reading for the deep-sea fish" .)

I've seen this clue in The Irish Independent.

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