The most common and most likely answer to this crossword clue is the 9 letter word TEN-MONTH
I've seen this crossword clue in Independent
T
E
N
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M
O
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T
H
Buddy explains!
The straight part
We know that "like (the length of) our (the UK’s) football season" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case like (the length of) our (the uk’s) football season = ten-month.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.