What they can view from the Gulf of Aden in tiered seating (6)

I believe the answer is:

redsea

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'what they can view from the gulf of aden' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'in tiered seating' is the wordplay.
'in' indicates a hidden word.
'REDSEA' is hidden within 'tiered seating'.

Can you help me to learn more?

(Other definitions for redsea that I've seen before include "mass of water" , "Waterway" .)

I've seen this clue in The Irish Times.

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