Command fourth writer to be based at a specific location (13)

'be based at a specific location' is the definition.
I can't tell whether this definition defines the answer.

'command fourth writer' is the wordplay.
I cannot quite see how this works, but
'command' could be 'head' (heading is a kind of commanding) and 'head' is located in the answer.
'fourth' could be 'quarter' (synonyms) and 'quarter' is found in the answer.
'writer' could be 'ed' (I've seen this in other clues) and 'ed' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

'to' acts as a link.

Can you help me to learn more?