The most common and most likely answer to this crossword clue is the 7 letter word DHANSAK
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Buddy explains!

The straight part
We know that "Lentil dish?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lentil dish? = dhansak.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 DHANSAK mean?
DHANSAK noun- An Indian curry with lentils, vegetables, spices, cumin seeds, ginger, and garlic together with meat and either gourd or pumpkin.