Crossword Genius

Absurd alarm about Military Intelligence officer in the past (7)

Ross

I believe the answer is:

ammiral

I'm a little stuck... Click here to teach me more about this clue!

'past' is the definition.
Both the definition and answer are adjectives.
Perhaps they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

I've seen this clue in The Sunday Times and The Times.
Want a hint initially instead of a full solution? Install my app