Spanish hero indeed left yard? Without a doubt! (9)

'without a doubt' is the definition.
I can't tell whether this defines the answer.

'spanish hero indeed left yard?' is the wordplay.
I cannot really see how this works, but
'hero' could be 'cid' (El Cid, Spanish military hero) and 'cid' is located in the answer.
'left' could be 'l' (common abbreviation) and 'l' is located in the answer.
'yard?' could be 'y' (abbreviation) and 'y' is present in the answer.
The remaining letters 'deed' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?