Tube put in ground, we hear, for grower in fields (always)? (10)

I believe the answer is:

strawberry

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'tube' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for strawberry that I've seen before include "Fruit - kind of blonde" , "Summer fruit" , "For duke, leaves" , "summer delight" , "Eleven [NAEVUS]" .)

I've seen this clue in The Guardian.

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