Romantic group seek a plot for development (4,5)
I believe the answer is:
lake poets
'romantic group' is the definition.
(group of Romantic poets)
'seek a plot for development' is the wordplay.
'for development' indicates anagramming the letters.
'seek'+'a'+'plot'='seekaplot'
'seekaplot' with letters rearranged gives 'LAKE POETS'.
(Other definitions for lake poets that I've seen before include "Southey, Coleridge, etc." , "Some old English versifiers" , "Wordsworth, Coleridge and Southey" .)