New cool shelters additionally for a Great Dane (7)
I believe the answer is:
nielsen
'a great dane' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
'new cool shelters additionally' is the wordplay.
'new' becomes 'n'.
'cool' becomes 'in' (I've seen this in other clues).
'shelters' means one lot of letters goes inside another.
'additionally' becomes 'else' (I can't justify this - if you can you should believe this answer much more).
'in' placed around 'else' is 'ielsen'.
'n'+'ielsen'='NIELSEN'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for nielsen that I've seen before include "Danish composer, Carl (1865-1931)" , "Musician" , "Leslie --, Canadian actor" , "Carl -, Danish cmpsr." , "Scorer" .)