Cryptic crossword clue
More intelligent animal restricts physical exercise 6

The most common and most likely answer to this crossword clue is the 6 letter word DEEPER

I've seen this crossword clue in The Daily Telegraph
D
E
E
P
E
R

Buddy explains!

The straight part
We know that "More intelligent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more intelligent = deeper.
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 DEEPER mean?

DEEPER adjective
  1. (of a physical distance) Extending far away from a point of reference, especially downwards.
  2. (intellectual, social) Complex, involved.
  3. (sound, voice) Low in pitch.
  4. (of a color) Highly saturated.
  5. (sleep) Sound, heavy (describing a state of sleep from which one is not easily awoken).
  6. Immersed, submerged (in).
  7. Muddy; boggy; sandy; said of roads.
  8. (of time) Distant in the past, ancient.

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