What does the cryptic crossword clue "Agent without sleep is irritable (6)" mean?

The definition is "Agent". The wordplay uses a container (one word inside another). NAP (synonym="NAP") in SPY (synonym="SPY") = SNAPPY; definition: "irritable" The answer is SNAPPY.

Agent without sleep is irritable (6)

Guardian Cryptic #27448 | 9 Across | 2018-03-05 flower

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