A happy viewer is very encouraging (4,3)

I believe the answer is:

glad eye

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'very encouraging' is the definition.
The definition suggests a singular noun which matches the answer.

'a happy viewer' is the wordplay.
'a happy' becomes 'glad' (I've seen this in another clue).
'viewer' becomes 'eye' (organ which sees or views).
'glad'+'eye'='GLAD EYE'

'is' is the link.

Can you help me to learn more?

(Other definitions for glad eye that I've seen before include "look to attract lover?" , "stare" , "amorous glance" , "Seductive look" , "Seductive glance" .)

I've seen this clue in the Evening Standard.

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