Drive those off before Lent (10)

I believe the answer is:

shrovetide

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'lent' is the definition.
The answer and definition can be both related to time as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'drive those off' is the wordplay.
'off' is an anagram indicator.
'drive'+'those'='drivethose'
'drivethose' with letters rearranged gives 'SHROVETIDE'.

'before' acts as a link.

Can you help me to learn more?

(Other definitions for shrovetide that I've seen before include "Three days preceding Ash Wednesday" , "winter days" , "period before Lent" .)

I've seen this clue in The Daily Express.

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