Crossword Genius

Secure milk shake at last (4)

Ross

I believe the answer is:

tape

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'secure' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Maybe there's a link between them I don't understand?

'milk shake at last' is the wordplay.
'milk' becomes 'tap' (both can mean to exploit or use).
'at last' indicates one should take the final letters.
The last letter of 'shake' is 'e'.
'tap'+'e'='TAPE'

Can you help me to learn more?

(Other definitions for tape that I've seen before include "Race finishing-line" , "that race winner may break" , "Common medium for recording" , "Record - broken by the winner" , "Recording material" .)

I've seen this clue in The Sun.
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