Cortes becomes a loyal companion (6)

I believe the answer is:

escort

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'a loyal companion' is the definition.
'escort' can be an answer for 'companion' (escort is a kind of companion). I'm not sure about the 'a loyal' bit.

'cortes becomes' is the wordplay.
'becomes' indicates anagramming the letters.
'cortes' with letters rearranged gives 'ESCORT'.

Can you help me to learn more?

(Other definitions for escort that I've seen before include "Companion for social occasion" , "Accompany, chaperon" , "Companion in corset, perhaps military" , "wheels?" , "Companion (perhaps paid)" .)

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

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