Of developable importance in Malines, possibly (7)

I believe the answer is:

seminal

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'of developable importance in malines possibly' is the definition.
I can't tell whether this defines the answer.

'malines possibly' is the wordplay.
'possibly' indicates an anagram.
'malines' anagrammed gives 'SEMINAL'.

Can you help me to learn more?

(Other definitions for seminal that I've seen before include "Highy important" , "Original and influential" , "Of seed, or giving rise to new developments" , "Strongly influential" , "Major" .)

I've seen this clue in the Evening Standard.

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