Some oasis siesta for weaklings! (7)

I believe the answer is:

sissies

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

'weaklings' is the definition.
The answer and definition can be both people as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

'some oasis siesta for' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'SISSIES' can be found hidden inside 'oasis siesta for'.

Can you help me to learn more?

(Another definition for sissies that I've seen is " Informally, effeminate boys or cowardly men".)

I've seen this clue in The Times.

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