Pilgrim craft might blossom! (9)
I believe the answer is:
mayflower
'pilgrim craft' is the definition.
'mayflower' can be an answer for 'craft' (I have seen 'traditional craft' mean 'mayflower' so perhaps 'craft' could also mean 'mayflower'). I'm not sure about the 'pilgrim' bit.
'might blossom' is the wordplay.
'might' becomes 'may' (I've seen this in another clue).
'blossom' becomes 'flower' (synonyms).
'may'+'flower'='MAYFLOWER'
Can you help me to learn more?
(Other definitions for mayflower that I've seen before include "Historic vessel" , "Famous Pilgrim ship" , "vessel crossing ocean" , "Famous vessel" , "Pilgrim Fathers' vessel" .)