What does the cryptic crossword clue "Unlimited entry hacking into smart key (7)" mean?

The definition is "key". The wordplay uses a container (one word inside another). NTR (synonym="NTR") in COOL (synonym="”smart”") = CONTROL; definition: "key" The answer is CONTROL.

Unlimited entry hacking into smart key (7)

Guardian Cryptic #29031 | 3 Down | 2023-03-30 flower

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