Fancy seeing you at Lord's, Williams — sadly, I must go! (3,1,5,5)
I believe the answer is:
its a small world
'fancy' is the definition.
(I've seen this before)
'you at lord's williams sadly i must go' is the wordplay.
I cannot quite see how this works, but
'i' could be 'a' and 'a' is found in the answer.
an anagram of 'lord' is 'orld' which is located in the answer.
This may be the basis of clue (or it may be nonsense).
'seeing' is the link.
Can you help me to learn more?
(Other definitions for its a small world that I've seen before include "Fancy" , "observed in chance meeting" , "Comment on asteroid" .)