Rumoured share distribution at the end of May (7)
I believe the answer is:
hearsay
'rumoured' is the definition.
(I've seen this before)
'share distribution at the end of may' is the wordplay.
'distribution' is an anagram indicator.
'at the end' means one lot of letters go next to another.
'of may' becomes 'ay' (I can't justify this - if you can you should give a lot more credence to this answer).
'share' is an anagram of 'hears'.
'hears'+'ay'='HEARSAY'
Can you help me to learn more?
(Other definitions for hearsay that I've seen before include "Gossip or idle talk - it's not evidence" , "rumoured" , "Common talk" , "Testimony not based on direct knowledge" , "product of grapevine" .)