Like blocking shots by old Spanish maestro (7)
I believe the answer is:
picasso
'spanish maestro' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'like blocking shots by old' is the wordplay.
'like' becomes 'as'.
'blocking' indicates putting letters inside (block can mean to plug a gap in something).
'shots by' becomes 'pics' (I can't explain this - if you can you should give a lot more credence to this answer).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'as' inserted within 'pics' is 'picass'.
'picass'+'o'='PICASSO'
Can you help me to learn more?
(Other definitions for picasso that I've seen before include "Pablo, great Spanish painter" , "Spanish artist, 1881-1973" , "pioneer of Cubism" , "Spanish cubist painter" , "famous artist" .)