Discourage or exclude term memberships (5)

I believe the answer is:

deter

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'discourage' is the definition.
(synonyms)

'exclude term memberships' is the wordplay.
'DETER' is hidden within the letters.
But, I am not sure how the hidden word is indicated.

'or' is the link.

Can you help me to learn more?

(Other definitions for deter that I've seen before include "Put off (from an action)" , "Daunt" , "Hinder, prevent" , "Dishearten" , "Inhibit" .)

I've seen this clue in the Sydney Morning Herald.

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