The most common and most likely answer to this crossword clue is the 3 letter word DAL
I've seen this crossword clue in The Guardian
D
A
L
Buddy explains!
The straight part
We know that "In Hyderabad, a legume" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in hyderabad, a legume = dal.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 DAL mean?
DAL noun- Any of many dried husked pulses (legume), including peas, beans and lentils.
- A dish made from lentils, cooked with spices, tomatoes and onions etc.
- A tropical herb with yellow flowers; the pigeon pea.