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One having an L of a time passing a test? (6)

Ross

I believe the answer is:

driver

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'one having an l of a time passing a test?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is the entire clue.

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(Other definitions for driver that I've seen before include "Operator of a motor vehicle" , "Golf club for long shots" , "Member of RAC" , "chauffeuse" , "Motorist - golf club" .)

I've seen this clue in the Evening Standard.
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