Happy about union with Spanish hero being cleared (10)
I believe the answer is:
elucidated
'cleared' is the definition.
('elucidate' can be a synonym of 'clear')
'happy about union with spanish hero' is the wordplay.
'happy' becomes 'elated' (associated in meaning).
'about' means one lot of letters goes inside another.
'union with' becomes 'u' (I am not sure about this - if you are sure you should believe this answer much more).
'spanish hero' becomes 'cid' (I've seen this in other clues).
'u'+'cid'='ucid'
'elated' going around 'ucid' is 'ELUCIDATED'.
'being' is the link.
Can you help me to learn more?
(Another definition for elucidated that I've seen is " explained".)