Between five and 50, this palm would be essential (3)

I believe the answer is:

ita

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'between five and 50 this palm would be essential' is the definition.
'ita' can be an answer for 'palm' (I've seen this before). I am not certain of the remainder of the definition.

This is all the clue.

Can you help me to learn more?

(Other definitions for ita that I've seen before include "Palm" , "Exotic tree" , "SECOND PART OF 23" .)

I've seen this clue in The Telegraph.

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