Crossword Genius

Burdensome or laboured field study (6)

Ross

I believe the answer is:

leaden

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'burdensome' is the definition.
(thesaurus)

'laboured field study' is the wordplay.
'laboured field' becomes 'lea' (lea can mean a meadow or field of grass. I am not sure about the 'laboured' bit.).
'study' becomes 'den' (term for a study or office).
'lea'+'den'='LEADEN'

'or' is the link.

Can you help me to learn more?

(Other definitions for leaden that I've seen before include "Depressing - heavy" , "Heavy and slow, as if weighted down with heavy metal" , "Describes grey overcast skies" , "Heavy or slow, like dark-gray metal" , "Oppressive" .)

I've seen this clue in the Evening Standard.
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