Introduce an American loveless hero (5)

I believe the answer is:

usher

I'm a little stuck... Click here to teach me more about this clue!

'introduce' is the definition.
(I've seen this before)

'an american loveless hero' is the wordplay.
'an american' becomes 'US' (United States).
'loveless hero' becomes 'her' (I am not sure about this - if you are sure you should believe this answer much more).
'us'+'her'='USHER'

Can you help me to learn more?

(Other definitions for usher that I've seen before include "Cinema or wedding attendant" , "Theatre assistant" , "Minor court official" , "Theatre guide" , "Helper at wedding" .)

I've seen this clue in the Evening Standard.

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