Crossword Genius

Plant in trouble had up (6)

Ross

I believe the answer is:

dahlia

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

'plant in' is the definition.
'dahlia' can be an answer for 'plant' (I've seen this before). I am not sure about the 'in' bit.

'trouble had up' is the wordplay.
'trouble' becomes 'ail' ('ail' can be a synonym of 'trouble').
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'ail'+'had'='ailhad'
'ailhad' written backwards gives 'DAHLIA'.

Can you help me to learn more?

(Other definitions for dahlia that I've seen before include "Suggestive of soil" , "one in bed" , "Plant with tuberous roots and showy coloured flower heads" , "Garden plant with large brightly-coloured flowers" , "Flower, often ball-shaped" .)

I've seen this clue in The Telegraph.
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