Facepiece - visitor loses it (5)

I believe the answer is:

visor

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

'facepiece' is the definition.
I can't judge whether this defines the answer.

'visitor loses it' is the wordplay.
'loses' suggests deleting specific letters.
'visitor' with 'it' taken away is 'VISOR'.

Can you help me to learn more?

(Other definitions for visor that I've seen before include "Transparent flap on a helmet" , "Part of suit of armour" , "eye-shield" , "shade" , "Face guard; sun screen" .)

I've seen this clue in The Irish Independent.

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