Crossword Genius

Perhaps glass ceiling: no opening for job with old head of company at its core (8)

Ross

I believe the answer is:

obstacle

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'perhaps glass ceiling' is the definition.
(I know that glass ceiling is a obstacle)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for obstacle that I've seen before include "stumbling block" , "Stab Cleo (anag) - which hinders progress" , "Thing blocking progress" , "Block to progress" , "It obstructs or hinders" .)

I've seen this clue in The Guardian.
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