Without listening, manage to understand border study (7)

I believe the answer is:

lipread

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'without listening manage to understand' is the definition.
I can't judge whether this defines the answer.

'border study' is the wordplay.
'border' becomes 'lip' (I've seen this in another clue).
'study' becomes 'read' (synonyms).
'lip'+'read'='LIPREAD'

Can you help me to learn more?

(Another definition for lipread that I've seen is " Interpret someone''s words when deaf".)

I've seen this clue in The Irish Times.

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