Crossword Genius

At times, only part of a rubber? (6)

Ross

I believe the answer is:

eraser

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'a rubber?' is the definition.
(rubber can mean an eraser)

'at times only part' is the wordplay.
'at' is a charade indicator (letters next to each other).
'times' becomes 'eras' (era is a kind of time).
'only part' becomes 'er' (I can't explain this - if you can you should believe this answer much more).
'eras' next to 'er' is 'ERASER'.

'of' is the link.

Can you help me to learn more?

(Other definitions for eraser that I've seen before include "A student's rubber, or the one who uses it" , "An Indian rubber" , "device for deleting things" , "Obliterator" , "Correcting implement used in drawing or writing" .)

I've seen this clue in the Evening Standard.
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