The most common and most likely answer to this crossword clue is the 4 plus 4 letter word CLUB FOOT
I've seen this crossword clue in The Guardian
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Buddy explains!
The straight part
We know that "condition making it hard to walk" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case condition making it hard to walk = club foot.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.
What does CLUB FOOT mean?
CLUB FOOT adjective- Club-footed.
- A congenital deformity of the foot in which the ankle, heel and toes are twisted.