Oilseed rape cost hit great dishes

I believe the answer is:

radiotelescopes

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'great dishes' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe there's an association between them I don't understand?

'oilseed rape cost hit' is the wordplay.
'hit' is an anagram indicator.
'oilseed'+'rape'+'cost'='oilseedrapecost'
'oilseedrapecost' anagrammed gives 'RADIO TELESCOPES'.

Can you help me to learn more?

I've seen this clue in The Daily Mail.

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