The most common and most likely answer to this crossword clue is the 7 letter word RECKONS
R
E
C
K
O
N
S
Buddy explains!
The straight part
We know that "Calculates/guesses" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case calculates/guesses = reckons.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 RECKONS mean?
RECKONS verb- To count; to enumerate; to number; also, to compute; to calculate.
- To count as in a number, rank, or series; to estimate by rank or quality; to place by estimation; to account; to esteem; to repute.
- To charge, attribute, or adjudge to one, as having a certain quality or value.
- To conclude, as by an enumeration and balancing of chances; hence, to think; to suppose; -- followed by an objective clause
- To reckon with something or somebody or not, i.e to reckon without something or somebody: to take into account, deal with, consider or not, i.e. to misjudge, ignore, not take into account, not deal with, not consider or fail to consider; e.g. reckon without one's host
- To make an enumeration or computation; to engage in numbering or computing.
- To come to an accounting; to draw up or settle accounts; to examine and strike the balance of debt and credit; to adjust relations of desert or penalty.