Quill writer Albert used to pen his article (7)

'quill' is the definition.
(I know that quill can be written as calamus)

'writer albert used to pen his article' is the wordplay.
I cannot quite see how this works, but
'albert' could be 'al' and 'al' is found within the answer.
'writer' could be 'camus' (author Albert Camus) and 'camus' is present in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?